One common theme is redemption. Dabi, with his troubled past, often has a journey towards redemption, and Shoto can play a part in that. Another theme is family. Given their complex family relationships in the original story, fanfics often explore how they deal with family issues together.
Well, in the MHA manga, Dabi does meet his end. It's a poignant moment that has significant implications for the story's progression and the dynamics among the characters.
There's also 'The Unlikely Bond'. In this fanfic, Dabi and Shoto start off as enemies but gradually find common ground. It has some really interesting character development and plot twists that keep you hooked.
One common theme is identity struggle. Since the OC is now in Shoto's body, they have to figure out how to balance their original self with the new identity. Another theme is power exploration. They have to learn to use Shoto's quirk effectively. And also, family relationships are often explored as Shoto has a complex family situation in MHA.
Well, there's 'My Reincarnation as Shoto' which has an interesting take on the concept. The story focuses on how the OC's memories and personality change the way Shoto approaches relationships with his family and friends in the MHA universe. There are also some fanfics that are less well - known but still great, like 'Reincarnated into Shoto's World' where the OC - turned - Shoto has to deal with the villains in a unique way based on their previous life experiences.
A villain like Shigaraki would likely be interested in the power levels in the MCU fanfiction. He's always looking for ways to increase his own power, and seeing the various powerful artifacts and abilities in the MCU might give him some ideas. He could think about how he could use similar things in his own plans to take over the MHA world.
There are also cases where Shouto could be in shock. The suddenness of the kidnapping could leave him stunned for a while. During this time, Dabi could have the upper hand. But as Shouto recovers, his natural instincts as a hero trainee kick in, and he starts to think of ways to get free and stop Dabi's plan, whatever it may be.
If the MHA characters were to react to a Mastermind fanfiction, some would be more accepting than others. Characters like Ochaco might find it really exciting. She's a fan of the heroes herself, so seeing different takes in fanfiction would be like getting a new perspective on the MHA world. However, characters like Shoto, who are more reserved, might be a bit hesitant. He might need some time to process what he's reading. But overall, it would be a very interesting scenario as it would show how the characters view different interpretations of their world.
Some characters would be shocked. For example, if the fanfiction had a really dark and unexpected Mastermind plot, like a hero turning out to be the mastermind of all the villains' plans, characters like Tsuyu would be very taken aback. She'd probably question the motives behind such a plot. Then there are characters like Denki. He might be more into it if it had some cool action scenes in the fanfiction, regardless of how out - of - the - blue the Mastermind storyline was. And Nejire would probably be super curious about the emotional depth of the characters in the fanfiction.
MHA characters might also be a bit jealous of some of the superpowers or unique abilities in other anime fanfiction. In their world, quirks are relatively well - defined, but in some other anime, there are really out - of - this - world powers. They could be in awe of the creativity and at the same time, try to figure out how they could incorporate some of those ideas into their own fighting styles. Like, if they read a fanfiction about a character who can manipulate time, they might start thinking about how they could use their quirks in a time - related way.